feat(editor): add system font selection

[murongg]

Summary

• Add an editor font family preference backed by native system font enumeration.
• Add a searchable font dropdown with localized labels, option previews, and selected-value preview.
• Apply the selected font to visual/source editor surfaces and migrate older localized saved values to CSS-usable family names.

Why

• Lets users customize the editor font while keeping WebView-compatible font application.

Validation

• pnpm --filter @markra/app test passed: 84 files, 1228 tests.
• pnpm --filter @markra/app typecheck:test passed.
• pnpm --filter @markra/app build passed.
• pnpm --filter @markra/desktop test passed: 10 files, 98 tests.
• pnpm --filter @markra/desktop typecheck:test passed.
• pnpm --filter @markra/desktop build passed, including vendor chunk verification.
• cargo test --manifest-path apps/desktop/src-tauri/Cargo.toml passed: 159 tests, with existing menu dead_code warnings.

Risk

• Font family labels and CSS family names can differ by platform. The implementation keeps separate display labels and CSS family values, with fallback behavior when platform-native labels are unavailable.

Closes #281

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Project	Deployment	Actions	Updated (UTC)
markra-web	Ready	Preview, Comment	Jun 18, 2026 5:28am